Improvement in fire-pots for stoves and furnaces



B. FRANKLIN.

Fire-Pot for Stoves and Furnaces.

No.128,296. PatentedJune25,1872.

7 mare: 7" fzzue/lzijr UNITED STATES PATENT OFFICE.

BENJAMIN FRANKLIN, OF INDIANAPOLIS, INDIANA.

IMPROVEMENT IN FIRE-POTS FOR STOVES AND FURNACES.

Specification forming part of Letters Patent No. 128,296, dated June 25, 1872.

SPECIFICATION.

I, BENJAMIN FRANKLIN, of Indianapolis, in the county of Marion and State of Indiana, have invented Improvements in the Construc-- tion of Fire Pots or Chambers for Stoves and Furnaces, of which the following is a specification: 1

My invention relates" to certain improvements in the subject-matter of the Letters Patent granted to me, and hearing date March 26,1872. In the practical operation of the invention therein described I have found that in the early stages of combustion the consumption of fuel and prevention of smoke are not perfect, and that when the fuel-level falls very low the supply of air is too high above it. To remedy these defects and insure perfect combustion at all times, both when the fire is first started and also when the fuellevel is very low, I perforate the fire-pot with horizontal apertures below the terminuses of the vertical slits, beginning with said apertures near the grate and continuing them one above the other at comparatively slight intervals. I also form on the upper outer edge of these horizontal apertures projections or slopin g flanges, in order to divert the upward currents of air in the inclosin g air-chamber which surrounds the fire-pot, the flanges on the upper apertures each projecting out a little beyond that next below it. n

In the accompanying drawing, A represents the fire-pot of my improved furnace, formed of two or more annular sections, A A A. The upper section A is constructed substantially as described in my above-mentioned Letters Patent, with vertical slits r r r, terminating above in a horizontal aperture or series of horizontal openings, as shown in the drawing. The lower sections A A are not so perforated, but are so far separated by means of lugs s s as to leave between them the horizontal apertures O O, as illustrated in the drawing. D D are flanges or downwardly-inclined projections formed upon the lower outer edge of each section of the fire-pot, so as to project over the horizontal opening left between it and the section next below. The operation of these flanges is to check the lip-rushing air and deflect it into the horizontal openings, where it will find its way to the fuel in the fire-chamber. Should the fuel be so high as to cover and close the lower opening the air will pass to the next, and the supply thereof to the fuel be thus automatically regulated. E is the ash-pit, below the fire-pot; K, the concentric inclosing-jacket of the furnace; W, its inclosing air-chamber; and P P, the apertures through which said chamber is supplied with air.

Although it is, ordinarily, preferable to construct the fire-pot in sections, and to form the horizontal air-openings by slightly separating the sections, still it is evident that the fire-pot may be constructed in one piece, and the horizontal apertures be formed directly in the body thereof. v

I claim as my invention- 1. The fire-chamber of a stove or furnace constructed with one or more horizontal encircling slits or apertures formed above the grate, and provided with sloping flanges or deflectors just above the apertures that project outwardly from the walls of the chamber-to intercept the current of air and direct it through the apertures, substantially as set 

